An image information coding apparatus includes a cut-out or extracting unit for cutting out image information into blocks each having a predetermined size, e.g., 4.times.4 pixels, a preprocessing unit such as an orthogonal transformation unit (e.g., a Hadamard transformation unit) and a scalar ...http://www.google.fr/patents/US5721791?utm_source=gb-gplus-shareBrevet US5721791 - Image information coding apparatus
